/*
 * Copyright (c) 2018 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <sys/errno.h>
#include <zephyr.h>
#include <bluetooth.h>
#include <conn.h>

#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_SETTINGS)
#define LOG_MODULE_NAME bt_settings
#include "log.h"

#include "hci_core.h"
#include "settings.h"
#include "keys.h"
#include "gatt.h"
#if defined(BFLB_BLE)
#include <stdlib.h>
#if defined(CONFIG_BT_SETTINGS)
#include "easyflash.h"
#endif
#include <FreeRTOS.h>
#include "portable.h"
#endif

#if defined(CONFIG_BT_SETTINGS_USE_PRINTK)
void bt_settings_encode_key(char *path, size_t path_size, const char *subsys,
			    bt_addr_le_t *addr, const char *key)
{
	if (key) {
		snprintk(path, path_size,
			 "bt/%s/%02x%02x%02x%02x%02x%02x%u/%s", subsys,
			 addr->a.val[5], addr->a.val[4], addr->a.val[3],
			 addr->a.val[2], addr->a.val[1], addr->a.val[0],
			 addr->type, key);
	} else {
		snprintk(path, path_size,
			 "bt/%s/%02x%02x%02x%02x%02x%02x%u", subsys,
			 addr->a.val[5], addr->a.val[4], addr->a.val[3],
			 addr->a.val[2], addr->a.val[1], addr->a.val[0],
			 addr->type);
	}

	BT_DBG("Encoded path %s", log_strdup(path));
}
#else
void bt_settings_encode_key(char *path, size_t path_size, const char *subsys,
			    bt_addr_le_t *addr, const char *key)
{
	size_t len = 3;

	/* Skip if path_size is less than 3; strlen("bt/") */
	if (len < path_size) {
		/* Key format:
		 *  "bt/<subsys>/<addr><type>/<key>", "/<key>" is optional
		 */
		strcpy(path, "bt/");
		strncpy(&path[len], subsys, path_size - len);
		len = strlen(path);
		if (len < path_size) {
			path[len] = '/';
			len++;
		}

		for (s8_t i = 5; i >= 0 && len < path_size; i--) {
			len += bin2hex(&addr->a.val[i], 1, &path[len],
				       path_size - len);
		}

		if (len < path_size) {
			/* Type can be either BT_ADDR_LE_PUBLIC or
			 * BT_ADDR_LE_RANDOM (value 0 or 1)
			 */
			path[len] = '0' + addr->type;
			len++;
		}

		if (key && len < path_size) {
			path[len] = '/';
			len++;
			strncpy(&path[len], key, path_size - len);
			len += strlen(&path[len]);
		}

		if (len >= path_size) {
			/* Truncate string */
			path[path_size - 1] = '\0';
		}
	} else if (path_size > 0) {
		*path = '\0';
	}

	BT_DBG("Encoded path %s", log_strdup(path));
}
#endif

#if !defined(BFLB_BLE)
int bt_settings_decode_key(const char *key, bt_addr_le_t *addr)
{
	if (settings_name_next(key, NULL) != 13) {
		return -EINVAL;
	}

	if (key[12] == '0') {
		addr->type = BT_ADDR_LE_PUBLIC;
	} else if (key[12] == '1') {
		addr->type = BT_ADDR_LE_RANDOM;
	} else {
		return -EINVAL;
	}

	for (u8_t i = 0; i < 6; i++) {
		hex2bin(&key[i * 2], 2, &addr->a.val[5 - i], 1);
	}

	BT_DBG("Decoded %s as %s", log_strdup(key), bt_addr_le_str(addr));

	return 0;
}

static int set(const char *name, size_t len_rd, settings_read_cb read_cb,
	       void *cb_arg)
{
	ssize_t len;
	const char *next;

	if (!name) {
		BT_ERR("Insufficient number of arguments");
		return -ENOENT;
	}

	len = settings_name_next(name, &next);

	if (!strncmp(name, "id", len)) {
		/* Any previously provided identities supersede flash */
		if (atomic_test_bit(bt_dev.flags, BT_DEV_PRESET_ID)) {
			BT_WARN("Ignoring identities stored in flash");
			return 0;
		}

		len = read_cb(cb_arg, &bt_dev.id_addr, sizeof(bt_dev.id_addr));
		if (len < sizeof(bt_dev.id_addr[0])) {
			if (len < 0) {
				BT_ERR("Failed to read ID address from storage"
				       " (err %zu)", len);
			} else {
				BT_ERR("Invalid length ID address in storage");
				BT_HEXDUMP_DBG(&bt_dev.id_addr, len,
					       "data read");
			}
			(void)memset(bt_dev.id_addr, 0,
				     sizeof(bt_dev.id_addr));
			bt_dev.id_count = 0U;
		} else {
			int i;

			bt_dev.id_count = len / sizeof(bt_dev.id_addr[0]);
			for (i = 0; i < bt_dev.id_count; i++) {
				BT_DBG("ID[%d] %s", i,
				       bt_addr_le_str(&bt_dev.id_addr[i]));
			}
		}

		return 0;
	}

#if defined(CONFIG_BT_DEVICE_NAME_DYNAMIC)
	if (!strncmp(name, "name", len)) {
		len = read_cb(cb_arg, &bt_dev.name, sizeof(bt_dev.name) - 1);
		if (len < 0) {
			BT_ERR("Failed to read device name from storage"
			       " (err %zu)", len);
		} else {
			bt_dev.name[len] = '\0';

			BT_DBG("Name set to %s", log_strdup(bt_dev.name));
		}
		return 0;
	}
#endif

#if defined(CONFIG_BT_PRIVACY)
	if (!strncmp(name, "irk", len)) {
		len = read_cb(cb_arg, bt_dev.irk, sizeof(bt_dev.irk));
		if (len < sizeof(bt_dev.irk[0])) {
			if (len < 0) {
				BT_ERR("Failed to read IRK from storage"
				       " (err %zu)", len);
			} else {
				BT_ERR("Invalid length IRK in storage");
				(void)memset(bt_dev.irk, 0, sizeof(bt_dev.irk));
			}
		} else {
			int i, count;

			count = len / sizeof(bt_dev.irk[0]);
			for (i = 0; i < count; i++) {
				BT_DBG("IRK[%d] %s", i,
				       bt_hex(bt_dev.irk[i], 16));
			}
		}

		return 0;
	}
#endif /* CONFIG_BT_PRIVACY */

	return -ENOENT;
}

#define ID_DATA_LEN(array) (bt_dev.id_count * sizeof(array[0]))

static void save_id(struct k_work *work)
{
	int err;
	BT_INFO("Saving ID");
	err = settings_save_one("bt/id", &bt_dev.id_addr,
				ID_DATA_LEN(bt_dev.id_addr));
	if (err) {
		BT_ERR("Failed to save ID (err %d)", err);
	}

#if defined(CONFIG_BT_PRIVACY)
	err = settings_save_one("bt/irk", bt_dev.irk, ID_DATA_LEN(bt_dev.irk));
	if (err) {
		BT_ERR("Failed to save IRK (err %d)", err);
	}
#endif
}

K_WORK_DEFINE(save_id_work, save_id);
#endif //!BFLB_BLE
#if defined (BFLB_BLE)
#if defined(CONFIG_BT_SETTINGS)
bool ef_ready_flag = false;
int bt_check_if_ef_ready()
{
    int err = 0;
    
    if(!ef_ready_flag){
        err = easyflash_init();
        if(!err)
            ef_ready_flag = true;
    }

    return err;
}

int bt_settings_set_bin(const char *key, const uint8_t *value, size_t length)
{    
    int err;

    err =  bt_check_if_ef_ready();
    if(err)
        return err;

    err = ef_set_env_blob(key, value, length);

    return err;
}

int bt_settings_get_bin(const char *key, u8_t *value, size_t exp_len, size_t *real_len)
{
    int err;
    size_t rlen;

    err = bt_check_if_ef_ready();
    if(err)
        return err;

    rlen = ef_get_env_blob(key, value, exp_len, NULL);

    if(real_len)
        *real_len = rlen;

    return 0;
}

int settings_delete(const char *key)
{
    return ef_del_env(key);
}

int settings_save_one(const char *key, const u8_t *value, size_t length)
{
    return bt_settings_set_bin(key, value, length);
}
#endif //CONFIG_BT_SETTINGS
#endif

void bt_settings_save_id(void)
{
#if defined(BFLB_BLE)
#if defined(CONFIG_BT_SETTINGS)
    if(bt_check_if_ef_ready())
        return;
    bt_settings_set_bin(NV_LOCAL_ID_ADDR, (const u8_t *)&bt_dev.id_addr[0], sizeof(bt_addr_le_t)*CONFIG_BT_ID_MAX); 
#if defined(CONFIG_BT_PRIVACY)
    bt_settings_set_bin(NV_LOCAL_IRK, (const u8_t *)&bt_dev.irk[0], 16*CONFIG_BT_ID_MAX); 
#endif //CONFIG_BT_PRIVACY
#endif //CONFIG_BT_SETTINGS
#else   
	k_work_submit(&save_id_work);
#endif
}

#if defined(BFLB_BLE)
#if defined(CONFIG_BT_SETTINGS)
void bt_settings_save_name(void)
{
    bt_settings_set_bin(NV_LOCAL_NAME, (u8_t*)bt_dev.name, strlen(bt_dev.name)+1);
}

void bt_local_info_load(void)
{
    if(bt_check_if_ef_ready())
        return;
#if defined(CONFIG_BT_DEVICE_NAME_DYNAMIC)
    bt_settings_get_bin(NV_LOCAL_NAME, (u8_t*)bt_dev.name, CONFIG_BT_DEVICE_NAME_MAX, NULL);
#endif
    bt_settings_get_bin(NV_LOCAL_ID_ADDR, (u8_t *)&bt_dev.id_addr[0], sizeof(bt_addr_le_t)*CONFIG_BT_ID_MAX, NULL);
#if defined(CONFIG_BT_PRIVACY)
    bt_settings_get_bin(NV_LOCAL_IRK, (u8_t *)&bt_dev.irk[0][0], 16*CONFIG_BT_ID_MAX, NULL);
#endif
}
#endif //CONFIG_BT_SETTINGS
#endif

#if !defined(BFLB_BLE)
static int commit(void)
{
	BT_DBG("");

#if defined(CONFIG_BT_DEVICE_NAME_DYNAMIC)
	if (bt_dev.name[0] == '\0') {
		bt_set_name(CONFIG_BT_DEVICE_NAME);
	}
#endif
	if (!bt_dev.id_count) {
		int err;

		err = bt_setup_id_addr();
		if (err) {
			BT_ERR("Unable to setup an identity address");
			return err;
		}
	}

	/* Make sure that the identities created by bt_id_create after
	 * bt_enable is saved to persistent storage. */
	if (!atomic_test_bit(bt_dev.flags, BT_DEV_PRESET_ID)) {
		bt_settings_save_id();
	}

	if (!atomic_test_bit(bt_dev.flags, BT_DEV_READY)) {
		bt_finalize_init();
	}

	return 0;
}

SETTINGS_STATIC_HANDLER_DEFINE(bt, "bt", NULL, set, commit, NULL);

#endif //!BFLB_BLE

int bt_settings_init(void)
{
#if defined(BFLB_BLE)
    return 0;
#else
	int err;

	BT_DBG("");

	err = settings_subsys_init();
	if (err) {
		BT_ERR("settings_subsys_init failed (err %d)", err);
		return err;
	}

	return 0;
#endif
}
